Dedoimed posted a tutorial explaining how to install Nvidia proprietary drivers in Ubuntu 12.10 Quantal Quetzal

This is NOT a trivial topic. In all past releases of Ubuntu, the Additional Drivers window would pop up, you would select the desired driver, Activate it, wait a few minutes till it's configured, then reboot. Job done. Not so anymore in Quantal Quetzal.

I have already elaborated on the steps needed to properly configure Nvidia drivers in Ubuntu 12.10, but a dedicated tutorial is required. Please follow me, as this will save you from grief, frustration, problems, and maybe even from having systems that won't boot. The emphasis is on maybe. But do read on, please.

  How to install Nvidia drivers in Ubuntu 12.10